Locomotive fire-box.



J. BLACK & J. FRAME.

LOGOMOTIVE FIRE BOX. APPLICATION FILED MAR. 7, 1914'.

1, 1 1 9,490, Patented Dec. 1, 1914.

J. BLACK & J. FRAME.

LOCOMOTIVE FIRE BOX..

APPLICATION FILED MAR. 7, 1914.

1,1 19,490. Patented Dec. 1, 1914.

2 SHEETSSHEET 2.

c if] 6 Wfizaszs'es: lgvizjb nmi 04%? GQMJW burning oil fuel.

JAMES BLACK AND JAMES FRAME, OF G-IASGOW, SCOTLAND.

' LOCOMOTIVE FIRE-BOX.

Specification of Letters Patent.

Patented Dec. 1, r914...

Application filed March 7, 1914;. Serial No. 823,190.

To all whom it may concern Be it known that we, JAMES BLACK and JAMES FRAME, subjects of the King of Great Britain, residing at Langside, Glasgow, Scotland, and Cathcart, Glasgow, Scotland, respectively, have invented certain new and useful Improvements in Locomotive Fire-Boxes, of. which the following is a specification.

This invention relates to fire boxes-of locomotives of the type having a'firing chamber and a combustion chamber separated from one another by means of a partition wall on which the brick arch rests. This type of fire box, as usually constructed, has but a limited application in practice as it is only suitable for working with shallow fires,

and, therefore, in coal or wood burning fireboxes, blow holes are liable to form in the fuel bed and cause tube troubles while the shallowness of this type of box, with its limited volume, renders it unsuitable for Further, the high level of the fuel bed renders it necessary to fit the brick arch at such a height above the/bottom rows of flue tubes that the passage of the hot gases toward the flue tubes is impeded.

This invention has for its object, firstly, to so construct the fire box that a suitable depth of firing chamber isprovided above the fuel bed; secondly, to increase the size of the fire box so as to give the maximum heating surface, an increased fire box volume above the fuel bed and a longer flame way from the fuel to the flue tubes; thirdly, to so construct and fit the fire box that, when necessary, it can, when of the wide bottom form, be readily disconnected and bodily lowered down out of position without removing the back shell plate; and, fourthly, to introduce through the brick arch a secondary hot air supply either delivering to the top of the fire from the bottom of the arch or to the combustion chamber from the top of the arch, or both.

The main feature of the invention is a special construction of foundation ring which. instead of being made as usual, is at the sides made of a stepped or bent formation. The sides of the ring can extend from the tube and throat plates rearwa d and be either horizontal or inclined for a portion of their length and then, at the front of the fuel bed, they bend downward either vertically or at an angle so that the ring at its rear portion, which may be either horizontal or inclined, is wholly or partly at a lower level than the front portion, such lower level being arranged to suit the fuel bed of the firing chamber.

In order that the invention may be properly understood we have hereunto appended explanatory drawings which show, by way of example, different modes of carrying the invention into efi'ect.

Figure 1 shows, in vertical section, one

mode of constructinga locomotive fire box in accordance with the invention. Fig. 1' is a. view of the foundation ring. Fig. 2 shows a similar construction of fire box but with a mid-feather. Fig. 3 shows another form of the fire box and Fig. 4- shows a modification of the arrangement Fig. 3. On the drawings, A represents the fire box, B the boiler barrel, C the flue tubes, D the combustion chamber, E the firing chamber, F the brick arch, G the back water leg, and H the ash hopper. 4

The same reference letters wherever repeated indicate the same or similar parts.

In the construction shown at Fig. 1, the tube plate a and throat plate I) are arranged at a suitable distance in advance of the fuel bed and the foundation ring 0 is, atgc declined to suit the fuel bed, the ring extendingforward to the front of the fuel-bed of the firing-chamber where it is bent upward, at 0 forming a support for the front wall cl of the firing chamber, and, thereafter, it is extended, at 0 horizontally or' substantially horizontally to the tube and throat plates. The front furnace wall' (Z is protected by fire bricks e, or equivalent, an air space 6 being left between the wall and the bricks .e. The brick arch F extends from the top of this wall upward and toward the rear at a slight incline as shown and it serves to separate the combustion chamber from the firing chamber. The bottom of the combustion chamber is constituted by the said arch F and also by a steel plate or castingf which may be a continuation of, or be fixed to, the plate '05 forming the front furnace wall, this plate 7 being protected by a brick lining at m. A counter-weighted or a spring door it is provided to the hopper bottom H (see Figs. 2, 3, and 4:) for the removal of ash deposited in the chamber.

It will be seen that, while the floor of the combustion chamber is retained at a level suitable for giving the hot gases free access to the bottom row of boiler tubes, the bottom of the firing chamber is wholly or partly, at a lower level, which is rendered possible by the stepped formation of the foundation ring.

The top of the front wall (Z and arch l and the position of the fuel bed are arranged as low as possible, thus providing for the largest possible volume in the fire box and the free passage of the hot gases toward the tubes.

The arch F may be made with a passage way 9 having ports 9 leading to the bottom of the combustion chamber and ports 9 leading'to the top of the firing chamber, a secondary supply of air being admitted at and passing upward between the brick work e and plate a? to the passage way 9 and then through the ports g 9 its the bricks become white hot, the entering air becomes highly heated. @f course, there may be merely the ports 9, or the ports 9 instead of both sets of ports. llhe entering air may be regulated by a cock indicated at 2'.

As the whole fire box is carried on the foundation ring and is fitted in position in the usual way it is obvious that it can be bodily withdrawn without removing the back shell plate 9' or breaking any of the joints of the fire box itself.

In the construction shown at Fig. 2 the brick work e is replaced by an inclined mid-feather or transverse water chamber Z communicating with the side water spaces of the firebox.

in the construction shown at Fig. 3, the foundation ring is made horizontal at vertically stepped at c and horizontal at 0 while there is a vertical mid-feather Z.

In the arrangement shown at Fig. f the foundation ring is horizontal at 0 declined at 0 vertical at 0 and horizontal at c, and in this case a vertically arranged transverse water chamber Z is employed, this chamber being simply inserted in position and connected by piping with any desired part of the boiler or water tank.

Having now fully described our invention, what we claim and desire to secure by Letters Patent is l, in a locomotive firebox having two chambers, a firing chamber and a combustion chamber, a foundation ring for both chambers and which from the level of the bottom of the front wall of the firing chamher is stepped vertically or substantially 1,1 iaaeo vertically upward to the level of the floor of the combustion chamber.

2. in a locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, a foundation ring for both chambers and which extends downward from its rear end and is then bent upward and thereafter continued forwardhorizontally or substantially horizontally.

3. In a locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, a foundation ring for both chambers and which is declined from its rear end and is then bent vertically upward and is thereafter continued forward horizontally.

v 4:. A locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, afoundation ring for both chambers and which isof a stepped formation at the sides thereof, and a front plate carried by said foundation ring at the stepped part thereof.

5. A locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, a foundation ring for both chambers and which is of a stepped forma tion at the sides thereof, a front plate carried by said foundation ring at the stepped part thereof and brickwork in rear of said plate and forming the front of the firing chamber.

6. A fire box divided into two chambers, a firing chamber and a combustion chamber,

the combustion chamber being at a higher level than the firing chamber, said fire lOOK being carried on a foundation ring which is bent upward at the front of the firing cham" her and is then continued forward so as to glgarry the bottom of the combustion cham- 7. A locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, the combustion chamber being at a higher level than the firing chamber, said firebox being carried on'a foundation ring which is bent upward at the front of the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, the part where the foundation ring is bent upward carrying the front wall of the firing chamber.

8. A locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, the combustion chamber being at a higher level than the firing chamber, said fire box being carried on a foundation ring which is bent upwardat the front of the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, the part where the foundation ring is bent upward carrying the front wall of the firing chamber and being protected by brickwork.

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tion ring which is bent upward at the front of the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, the part where the foundation ring is bent upward carrying a plate forming the front wall of the firing chamber, brickwork in rear of said plate and an air space between said plate and the brickwork.

10. A locomotive fire boxdivided into two chambers, a firing chamber and a combustion chamber, the combustion chamber, being at a-higher level than the firing chamber, said fire box being carried on a foundation ring which is bent upward at the front of 1 the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, the part where the foundation ring is bent upward carrying the front wall of the firing chamber, and an arch forming a partition between the firing chamber and the combustion chamber.

11. A locomotive fire box divided into two chambers, a firing chamber and a combusti on chamber, the combustion chamber being at a higher level than the firing chamber, said fire box being carried on a foundation ring which is bent upward at the front of the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, a front wall in'the' firing chamber at the part where the foundation ring is bent upward, an arch projecting from said wall at an angle thereto said arch serving as a partition between the firing chamber and the combustion chamber and having passageways therein for air to pass into the firing chamber.

12. A locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, the combustion chamber being at a higher level than the firing chamber, said fire box being carried on a foundation ring which is bent upward at the front the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, a front wall in the firing chamber at the part where the fonrr dation ring is bent upward, an arch project-.

ing from said wall at an angle thereto, said arch serving as a partition between the firing chamber and the combustion chamber and having passageways therein for air to pass into the combustion chamber.

3.3. locomotive fire box divided into two chambers, a firing chamber and a combos tion chamber. thecombustlon chamber being at a higher level than the firing chamber,

said box b91111? carried on a foundation ring which is bent upward at the front of the firing'chamber and is then continued forward so as to carry the bottom of the combustion chamber, a front wall in the firing chamber at the part where the foun dation ring is bent upward, an arch projecting from said wall at an angle thereto, said arch serving as a partition between the fir ingchamber and the combustion chamber and having passageways therein for air to pass into both the firing chamber and the combustion chamber. 7

14:. A locomotive fire box divided into two chambers, a firing chamber anda combustion chamber, the combustion chamber being at a higher level than the firing chamber, said fire box being carried on a foundation ring which is bent upward at the front of the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, a front wall in the firing chamber at the part where the foundation ring is bent upward, an arch projecting from said wall'at an angle thereto, said arch. serving as a partition between the firing chamber and the combustion chamber, and having passageways therein for air admitted to the arch by a, passageway in the front wall of the firing chamber.

15. A locomotive fire box divided into two chambers, a-firing chamber and a combustion chamber, the combustion chamber being at a higher level than the firing chamber, said fire box beingcarried on a foundation ring,which is bent upward at the front of the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, a front wall in the firing chamber at the part where the foundation ring is bent upward, an arch projecting from said wall at an angle thereto, said arch serving as a partition between the firing chamber and the combustion chamber and having passageways therein for air admittetl to the arch by a passageway 1n the front wall of the firing chamber, and means for regulating the admission of air to said passageway.

16. A locomotive fire box divided into two chambers, a firing chamber and a combustion chamber, the combustion chamber being at a higher level than the firing chamber, said fire box being carried on foundation ring which is bent upward at the front of the firing chamber and is then continued forward so as to carry the bottom of the combustion chamber, the part where the foundation rin is bent upward carrying the front wall of t e firing chamber, and means whereby air can be admitted throu h said front wall to either the combustion c amt-er or to the firing chamber. v

17. A locomotive fire box divided intotwo chambers, a firing chamber a combusne -ee part is time chamber, afoundation ring for Tooth. In testimony whereof We afix our signachambers anddwhich is fat afstepped formatures in presence of two Witnesses.

tion at the si es thereo a rent plate carried b? said foundation ring at the stepped 1ere0f and refractory means for pro- 1 L tecting said. front plate, said refractory Witnesses:

ineans forming the front Wall of the firing LEROY WEBER,

ehamben FRED MIDDLETON. 

